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Thread: Powering PC With Power Button Instead of Automatic Power

  1. #11
    Raw Wave Confused's Avatar
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    Quote Originally Posted by Nic
    what i have done is used a 3 way switch at the front of my car, the switch is on the ignition line that heads to the boot which controls the computer and my amps, if the switch is in position 1 it just acts like a normal ignition wire, position 2 is always on, and position 3 is always off. perhaps you could do something simmilar
    Bingo.

    Easiest way to do it IMO
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  2. #12
    Low Bitrate got2liv4him's Avatar
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    Smile What I did

    This is what I did... I don't know about auto shutdown
    Remote Switch and Indicator Light Setup
    Kimi ga kawareba, Seikaimo kawaru!

  3. #13
    Low Bitrate
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    I got an idea, tell me what you guys think...its pretty simple.

    I install a regular switch that powers the Opus. The switch will get its power from a distribution block that is going to be used in the trunk. Since this is what will power the opus I don't need to run any kind of ignition wire or anything to the Opus. Now what kind of switch I need is what I don't know. I would like to use something like a regular computer switch like this one:

    Switch

    If I use a switch like this, that it wouldn't be a problem for the Opus to power down the computer. What do you guys think?

  4. #14
    Variable Bitrate The Grinch's Avatar
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    A computer switch for an ATX case is a momentary push button switch. It is in an Off (open) state 99.99% of the time. When you press it, it is in an On (closed) state. As soon as you remove your finger, it's back to the open state again. So in a nutshell the momentary switch sends a quick pulse to the PC which triggers an event.

    The button you posted looks like a standard on-off switch (can't tell from the picture or description). You can't hook that up to the motherboard. The only two possibilities are for cutting the main power or controlling your Accessory-In power for the OPUS.

    Using the switch to kill the main power isn't adviseable because you can't do a clean shutdown with it. You'd have to wait for the PC to shutdown normally before you kill the power.

    The best idea is to put the switch on your Accessory-In. You can leave the switch in the off possition 24-7 until you are ready to use the PC. When you are done using the PC, you turn the switch off and the PC will shut down cleanly. The nice thing about this is even if you forget to turn the switch off, your PC will still shut down after the car is off.

    Accessory power
    --------------/ ----------------- ACC-in on OPUS (blue wire)
    on-off switch ^

    +12 volts
    --------------------------------- 12volt input on OPUS (red wire)

    Ground
    --------------------------------- Ground for on OPUS (black wire)
    Carputer progress meter: [-----|]
    Carputer gadget meter: [--|---]

  5. #15
    Maximum Bitrate eCarô's Avatar
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    Use a relay and a momentary button.

    If you set it up like this, the Opus will not recieve any power from the ACC wire, until the pushbutton is pressed. Then the relay stays "latched" until the ACC wire is powered down.
    Attached Images Attached Images  

  6. #16
    Variable Bitrate The Grinch's Avatar
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    That looks like a perfect solution to his problem. Do you need a resistor on the coil of that relay?
    Carputer progress meter: [-----|]
    Carputer gadget meter: [--|---]

  7. #17
    Maximum Bitrate eCarô's Avatar
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    No resistor needed if the coil is designed for ~12v.

  8. #18
    FLAC
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    You can use the uSDC20D for this. If you have a toogle switch on the ACC line, you can prevent the computer from ever starting up or drawing power. If you want to use it, flip the toggle switch when you want it on and it will shutdown like normal and you'll get all the benefits and protection of the shutdown controller.

    -Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  9. #19
    Variable Bitrate
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    so you don't want the pc to boot up on starting... byt do want it to shutdown,

    isn't the easiest solution just put an on of switch in you' existing wire to the ignition?

    if the switch is OFF it wil not boot, of its on it wil boot, and if you switch the car of it wil shut down right?

  10. #20
    StreetDeck Staff carbot's Avatar
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    just put a dashboard switch between IGN/ACC and the opus

    Like the last post said:


    IGNITION/ACCESSORY -------- DASHBOARD SWITCH ------- OPUS IGN input


    switch off + ignition off => computer off
    switch on + ignition off => computer off
    switch on + ignition on => computer on
    swtich off + ignition on => computer off
    Damien Stolarz
    Co-Founder, StreetDeck
    Author, Car PC Hacks
    http://www.streetdeck.com

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